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PRINCIPAL ACCOUNTING POLICIES - Allowance for doubtful accounts (Details) ¥ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2022 CNY (¥) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 CNY (¥) | Dec. 31, 2020 CNY (¥)
Allowance for expected credit losses |  |  |  |
Allowance at beginning of year | ¥ 815 |  | ¥ 799 | ¥ 256
Cumulative effect of adoption of new accounting standard |  |  |  | 83
Deconsolidation of subsidiaries |  |  | (1) | (27)
Provisions for credit losses | 296 | $ 43 | 141 | 700
Write-offs | (341) |  | (124) | (213)
Allowance at end of year | ¥ 770 |  | ¥ 815 | ¥ 799

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- Definition Allowance for credit losses deconsolidation of subsidiaries. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Cumulative effect of adoption of new accounting standard allowance for credit loss.. + References No definition available. + Details
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Namespace Prefix: | tcom_
Data Type: | xbrli:monetaryItemType
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- Definition Financial allowances for credit losses. + References No definition available. + Details
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Namespace Prefix: | tcom_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of direct write-downs of accounts receivable charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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- Definition Amount of expense (reversal of expense) for expected credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(5)) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 + Details
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